Hi > > The above says "Eventually, oom-killer never works". Is this no enough? > > The above says > > 1) current logic have a race > > 2) x86 increase a chance of the race by dma zone > > 3) if race is happen, oom killer don't work > > And the system hangs up, so it's a local DoS and I guess we should > backport the fix into -stable. I added this: > > : This resulted in the kernel hanging up when executing a loop of the form > : > : 1. fork > : 2. mmap > : 3. touch memory > : 4. read memory > : 5. munmmap > : > : as described in > : http://www.gossamer-threads.com/lists/linux/kernel/1348725#1348725 > > And the problems which the other patches in this series address are > pretty deadly as well. Should we backport everything? patch [1/4] and [2/4] should be backported because they are regression fix. But [3/4] and [4/4] are on borderline to me. they improve a recovery time from oom. some times it is very important, some times not. And it is not regression fix. Our oom-killer is very weak from forkbomb attack since very old days. Thanks. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>